The STL4P3LLH6 from STMicroelectronics is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 48 to 90 Milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for STL4P3LLH6 can be seen below.